Option [+3]

Fill your mouth with water and then try to cum without spitting the water out. If you fail, make yourself a cocktail of 1 cup of cream, 4 eggs, and a tablespoon of salt; drink it all in one go, this should imitate the taste and texture of semen.

Health warning - although raw eggs are very safe, make sure to use fresh eggs to be on the safe side. and try to buy eggs straight from a farm since they are much safer.